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    <title>Document</title>
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    <script>
        // var num = 100;
        // var num2 = num;

        // console.group('基本数据类型赋值开始');
        // console.log(num,num2);
        // num2= 999;
        // console.log(num,num2);
        // console.groupEnd('基本数据类型赋值结束')


        // var obj = {'name':'张三','age':18};
        // var obj2 = obj;

        // console.group('复杂数据类型赋值开始');
        // console.log(obj,obj2);
        // obj2.name = 'lisi';
        // console.log(obj,obj2);
        // console.groupEnd('复杂数据类型赋值结束')
        
        
    </script>
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